Among the various studies that led to the concept and design of Concorde, the visualizations obtained in the water tunnel
on a complete model emphasized the organization of the upper surface vortices which provide the aircraft with the extra lift
necessary at low speed.

The models were mounted with all the elements liable to affect the flow organization: drooped nose, undercarriage
down, ground represented (as in Image 10), simulated air intake and engine exhaust (shown in Image 13), etc. The
observations along various directions (from the top as shown here, and in cross-sections at the trailing edge shown in Image 12), permit a verification of the
results, particularly those concerning the wing vortices (in red) and the fuselage vortices (in green in the image shown here
and in Image 10).

Image created by Henri Werlé. Reproduced with permission from his spectacular
collection Courants et Couleurs published in 1974 by ONERA, the French Aerospace Lab.